用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密...用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密的氧化铝膜,产物经充分分散后在有机介质中或水中的稳定时间分别由改性前的2 m in和5 m in提高到2 h和1 d,紫外线透过率由改性前的大于8.5%降低到小于7%。展开更多
The optoelectronic properties of n-TiO2NW/p-Si heterojunction fabricated by depositing TiO2 nanowires on a p-Si substrate are studied. Under excitation at a wavelength of 370 nm, the TiO2 nanowires produce a light emi...The optoelectronic properties of n-TiO2NW/p-Si heterojunction fabricated by depositing TiO2 nanowires on a p-Si substrate are studied. Under excitation at a wavelength of 370 nm, the TiO2 nanowires produce a light emission at 435 nm due to the emission of free excitons. The I-V characteristics are measured to investigate the heterojunction effects under the dark environment and ultraviolet （UV） illumination, n-TiOzNW/p-Si has a p-n junction formed in the n-TiOz/p-Si beterojunction. TiO2NW/Si photodiode produces a pbotocurrent larger than dark current under UV illumination. It is observed that UV photons are absorbed in TiO2 and the heterojunction shows a 0.034-A/W responsivity at 4-V reverse bias.展开更多
The nanophotocatalytic process using semiconducting oxides with a nanostructure is one of the technologies used for the destructive oxidation of organic compounds such as dyes. The photocatalytic oxidation of a textil...The nanophotocatalytic process using semiconducting oxides with a nanostructure is one of the technologies used for the destructive oxidation of organic compounds such as dyes. The photocatalytic oxidation of a textile dye—C. I. Basic Blue 41 (BB41) in aqueous solution was assessed by UV ray irradiation in the presence of TiO2 nanoparticles. The effect of initial dye concentration, pH and TiO2 loading were investigated and the optimized conditions for maximum amount of degradation were determined. Analysis of the kinetics showed pseudo-first-order model. The mineralization of the dye was reported by measuring the initial and final chemical oxygen demand of the solution that was irradiated under optimized conditions.展开更多
文摘用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密的氧化铝膜,产物经充分分散后在有机介质中或水中的稳定时间分别由改性前的2 m in和5 m in提高到2 h和1 d,紫外线透过率由改性前的大于8.5%降低到小于7%。
文摘The optoelectronic properties of n-TiO2NW/p-Si heterojunction fabricated by depositing TiO2 nanowires on a p-Si substrate are studied. Under excitation at a wavelength of 370 nm, the TiO2 nanowires produce a light emission at 435 nm due to the emission of free excitons. The I-V characteristics are measured to investigate the heterojunction effects under the dark environment and ultraviolet （UV） illumination, n-TiOzNW/p-Si has a p-n junction formed in the n-TiOz/p-Si beterojunction. TiO2NW/Si photodiode produces a pbotocurrent larger than dark current under UV illumination. It is observed that UV photons are absorbed in TiO2 and the heterojunction shows a 0.034-A/W responsivity at 4-V reverse bias.
文摘The nanophotocatalytic process using semiconducting oxides with a nanostructure is one of the technologies used for the destructive oxidation of organic compounds such as dyes. The photocatalytic oxidation of a textile dye—C. I. Basic Blue 41 (BB41) in aqueous solution was assessed by UV ray irradiation in the presence of TiO2 nanoparticles. The effect of initial dye concentration, pH and TiO2 loading were investigated and the optimized conditions for maximum amount of degradation were determined. Analysis of the kinetics showed pseudo-first-order model. The mineralization of the dye was reported by measuring the initial and final chemical oxygen demand of the solution that was irradiated under optimized conditions.
